Combination-square.



G. A. KENWORTHY.

Patented Aug. 11, 1914.

2 SHEETS-SHEET 1.

wi/tweooao TH E AORRIS PETERS CO PHOTO-LITHOU \VASHINGiUN, D.

C. A. KBNWORTHY.- COMBINATION SQUARE. APPLICATION FILED MAY 10,1913,

1,1 07,077. Pate nted Aug. 11, 1914.

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CHARLES- A. KENWORTHY; on rnnmo, WASHINGTON.

COMBINATION-SQUARE.

Specification of Letters Patent.

Patented Aug. 11, 1914.

Application filed May 10, 1913. Serial No. 766,673.

To all whom it may concern:

Be it known that 1, CHARLES A. KEN- woRTHY, a citizen of the United States, re-

siding at Tenino, in the county of Thurston and State of Washington, have invented certain new and useful Improvements in Combination-Squares; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has for its object the provision of a combination squarevhaving various adjustments and accessories which adapt it to the use of all classes of mechanics.

Another object is to provide a flexible blade and means for adjusting the blade to conform with the convex surface of the obj ect being worked upon.

In the accompanying drawings, Figure 1 is a top plan view partly broken away of my improved combination square. Fig. 2 is a bottom plan view thereof, and, Fig. 3 is a transverse sectional view through the stock or body of the square.

Referring to the drawings, wherein similar reference characters correspond with similar parts throughout the several views, the numeral 1 indicates the stock or body of the square which is slotted at 2, to receive the blade 3 pivotally secured thereto by a thumb bolt 4. The blade 3 is extended inwardly of the body 1 and pointed at 5, while said body is suitably cut away to expose the point 5. Adjacent the point 5 the blade 3 is provided with a second thumb screw (3, adapted for adjustment within a curved slot 7 formed in the back of the body.

The point 5 works over an arcuate scale 8 which is marked off by lines and numbers to indicate the degree of the angle at which the blade 8 is set with respect to the working edge of the body 1. Inwardly of the scale 8 is arranged a row of numbers 9 which represent the number of sides comprising the polygons formed from thevarious corresponding angles or miters in the scale 8 mentioned above. By loosening the thumb screw (3, the blade 3 may be adjusted at any angle in respect to the working edge of the body 1, and secured in adjusted position by tightening said screw.

A flexible blade 10* is anchored at 11 to the central portion of the body 1 and forms the working edge thereof. A pair of arms 12 is pivoted adjacent its inner ends between the walls of the slotted portion of the body 1 and is linked at its outer extremities to the free ends of the blade 10 by the links 13. The adjacent ends of the arms 12 are toothed to provide the intermeshing segmental gears 14, whereby movement of one arm is simultaneously imparted to the other. The threaded shank 15 of a thumb screw is engaged within a split ring 16 carried by the body 1 and having a locking screw 17 positioned therethrough for securing the shank 15 in adjustedposition. The inner end of the shank 15 is recessed and threaded to receive a second shank 18 which is connected to one of the arms 12 by the pivoted straps 19. It will be understood that the threads on the outer shank 15 are pitched in one direction while those on the inner shank are pitched in the opposite direction, whereby rotation of the thumb screw will more quickly adjust the arms 12.

From the foregoing, it will be seen that the adjustment of the threaded shank 15 by mea of the finger grip thereon will simultaneously adjust both of the arms 12 and curve the blade 10 to any desired degree, as clearly illustrated in Fig. 2. The curved adjustment of the blade 10 is especially adapted for use in laying off angles or centers from a round or convex surface, and for such use the blade 3 is provided with a longitudinal slot 20 having one of the walls thereof disposed radially of the pivot 41 of said blade. For ordinary purposes, the blade 3 is preferably constructed of metal, however, the ordinary wooden blade having the transparent edges may be used if desired.

A table 21 is located upon the front of the body 1 for convenient reference and shows the common rafters and their degree cuts from a four inch rise to a twelve inch rise, also the per foot run in inches of each rise. The back of the body 1 is provided with two tables indicated by the numerals 22 and 23, the first table showing the hip and valley rafters and their degree cuts, the jacks and their side cuts, and also the per foot run of the hip and valley rafters in inches. The table 23 gives the length of the sides of the polygons having a circumscribed diameter of one foot, and also the increase in the length of the sides for each two inch increase in diameter. The last table also gives the degree miters of the sides of therespec tive figures.

l/Vh at I claim is 1. A square comprising a body, a straight blade pivotally adjustable about a pivot at the center of said body, a flexible blade centrally fixed to said body, pivoted arms connected to said flexible blade, and means for rotating said arms on their pivots whereby said flexible blade is curved.

2. [A square comprising a body, a straight blade pivotally adjustable about a pivot at thecenter of said body, a flexiblejblade centhe center of said body, a flexible blade centrally secured to said body, oppositely extending arms pivoted on said body and formed With intermeshing segmental gears, links connecting the outer ends of said arms With the ends of said flexible blade, and means for moving one of said arms whereby the opposite arm is simultaneously moved and the flexible blade is curved.

4. A square comprising a body, a straight blade pivoted thereto, a flexible blade centrally secured to said body, simultaneously movable arms pivoted on said body and connected to said flexible blade, and an ad justable shank connected to one of said arms.

In'testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

CHAR-LES A. KENVORTHY.

VVit-nesses J. F. CANON, O. FRANK SMITH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D; 0." 

